| 286 | } |
| 287 | |
| 288 | void WriteBand_Fmt20(Encoder &enc, int32_t colIndex, uint32_t formatId) { |
| 289 | const float currBlockValue = static_cast<float>(enc.m_currBlockBitValue); |
| 290 | const float halfCurrBlockValue = currBlockValue * 0.5f; |
| 291 | const int32_t minValue = (int32_t)ceilf(-32767.0f / currBlockValue); |
| 292 | const int32_t maxValue = (int32_t)floorf(32767.0f / currBlockValue); |
| 293 | |
| 294 | const float *pCurrSample = &enc.m_levelSlots[enc.m_levels][colIndex]; |
| 295 | int32_t currSampleIndex = enc.m_samples_per_subband; |
| 296 | while (currSampleIndex) { |
| 297 | --currSampleIndex; |
| 298 | int32_t val = (int32_t)floorf((*pCurrSample + halfCurrBlockValue) / currBlockValue); |
| 299 | if (minValue > val) { |
| 300 | val = minValue; |
| 301 | } else if (maxValue < val) { |
| 302 | val = maxValue; |
| 303 | } |
| 304 | |
| 305 | pCurrSample += enc.m_numColumns; |
| 306 | if (val == 0) { |
| 307 | if (currSampleIndex != 0 && !(int32_t)floorf((*pCurrSample + halfCurrBlockValue) / currBlockValue)) { |
| 308 | enc.m_bits.WriteBits(0, 1); |
| 309 | |
| 310 | if (currSampleIndex == 0) |
| 311 | return; |
| 312 | --currSampleIndex; |
| 313 | pCurrSample += enc.m_numColumns; |
| 314 | continue; |
| 315 | } |
| 316 | enc.m_bits.WriteBits(1, 2); |
| 317 | continue; |
| 318 | } |
| 319 | enc.m_bits.WriteBits(3, 2); |
| 320 | if (val < 0) { |
| 321 | val += 2; |
| 322 | } else { |
| 323 | ++val; |
| 324 | } |
| 325 | |
| 326 | enc.m_bits.WriteBits(val, 2); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | void WriteBand_Fmt21(Encoder &enc, int32_t colIndex, uint32_t formatId) { |
| 331 | const float currBlockValue = static_cast<float>(enc.m_currBlockBitValue); |